moduleArel#### Methods for creating various nodesmoduleFactoryMethodsdefcreate_joinfrom,to,on=nil,klass=Nodes::InnerJoinklass.new(from,to,on)enddefcreate_string_joinfrom,tocreate_joinfrom,to,nil,Nodes::StringJoinenddefcreate_andclausesNodes::And.newclausesendendend